Britney Spears Sweats It Out At The Studio Ahead Of Las Vegas Residency Announcement

Someone's busting their booty at rehearsals!

On Wednesday Britney Spears was snapped leaving the studio in Los Angeles, and while we're eagerly anticipating her duet with Miley Cyrus, the countdown is also on for the announcement about her residency deal in Las Vegas! I mean, that is what she's prepping for at dance practice!

Caesars Entertainment has reportedly invited employees to "come play a part in the biggest announcement in Las Vegas Entertainment History" on September 17, which, oddly enough, is the same date that BritneySpears.com is counting down to for that whole #AllEyesOnMe hoopla.

BreatheHeavy reports that participants are being told to meet at Planet Hollywood to be shuttled to an undisclosed location and to "expect this event to generate global media attention." We've been waiting MONTHS for official word and details about Brit's concert ... can't wait to find out more!